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Three people were assaulted aboard a Red Line "L" train Friday when a group of men stormed a car shouting their gang affiliation, prosecutors said Sunday.

Cameron D. Griggs, 19, was the only person arrested, though four other males also participated in the attack, said Assistant State’s Attorney Michael Rusch. Griggs, who prosecutors believe boarded a train at the 47thStreet Red Line station, was arrested just before 11 p.m. Friday at the 69thStreet station on the South Side. The other men fled the scene.